How can I map a memory of bytes from a kernel module to user space app?

Question

I would like to declare an array in kernel module and to access it within a userspace app. how can I do it?

How do I memory map it for using via userspace so it can be used by a user?

Giel · Accepted Answer · 2012-08-05 17:05:41Z

3

You will most likely need to implement a character device. Then in your instance of struct file_operations implement the mmap function.

answered Aug 5, 2012 at 17:05

Giel

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Comments

Gnurou · Accepted Answer · 2012-08-06 02:32:28Z

2

First result on Google, by the way.

answered Aug 6, 2012 at 2:32

Gnurou

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Federico · Accepted Answer · 2012-08-06 09:34:43Z

0

Linux Device Driver 3th Chapter 15. It talks about mmap. Chapter 3 and 6 talk about char devices.

answered Aug 6, 2012 at 9:34

Federico

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matthias.bgg · Accepted Answer · 2012-08-06 14:57:54Z

0

maybe the userspace I/O system will help you: https://www.osadl.org/?id=321

answered Aug 6, 2012 at 14:57

matthias.bgg

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